arXivDaily arXiv每日学术速递 周一至周五更新
全部学科分类 8081
2605.21754 2026-06-03 quant-ph cond-mat.mes-hall

Optics-microwave entanglement and state teleportation mediated by a cavity magnomechanical system

腔磁力机械系统介导的光学-微波纠缠与量子态隐形传态

F. Engelhardt, A. V. Bondarenko, A. Metelmann, Ya. M. Blanter, S. Viola Kusminskiy, V. A. S. V. Bittencourt

AI总结 本文提出利用腔磁力机械系统在光学和微波光子之间产生稳态输出纠缠,并实现高保真度的隐形传态协议。

Comments 18 pages, 12 figures

详情
AI中文摘要

在连续变量系统中产生可用的输出纠缠可以作为改善量子信息科学应用的可行资源。在这项工作中,我们展示了如何在光学和微波光子之间的两级转换装置中产生稳态输出纠缠,该装置采用共振耦合的磁性和机械激发,如Phys. Rev. Applied 18, 044059 (2022)所提出的。我们表明,对于优化频率转换效率的相同参数集,纠缠可以最大化,并且它可以用于基于隐形传态的状态转移协议,对于相干输入态的保真度接近1。我们提出了一种基于微米级钇铁石榴石盘的实现方案,并使用模拟结果和合理估计来评估优化条件下的性能。我们发现所提议装置的隐形传态最大保真度为$0.75$。

英文摘要

Generating usable output-entanglement in continuous variable systems can serve as a viable resource for improving applications in quantum information science. In this work, we show how to generate steady-state output-entanglement in a two-stage conversion setup between optical and microwave photon which employs resonantly coupled magnetic and mechanical excitations, as proposed in Phys. Rev. Applied 18, 044059 (2022). We show that the entanglement can be maximized for the same set of parameters which optimize the frequency-conversion efficiency, and that it can be leveraged for a teleportation-based state-transfer protocol for coherent input-states with fidelity close to unity. We propose an implementation based on an Yittrium Iron Garnet disk of micrometer scale, and use both simulation results and reasonable estimates to assess the performance under optimized conditions. We find a maximum teleportation fidelity of $0.75$ for the proposed setup.

2401.04203 2026-06-03 math.FA math.OA

Curvature, Dolbeault-Dirac operators, and an $\mathrm{L}^p$-index theorem on compact Kähler manifolds

曲率、Dolbeault-Dirac算子以及紧Kähler流形上的$\mathrm{L}^p$-指标定理

Cédric Arhancet

AI总结 本文在紧Kähler流形上建立了Dolbeault-Dirac算子的$\mathrm{L}^p$-Banach非交换几何框架,证明了其闭实现是双扇形的且具有有界$\mathrm{H}^\infty$泛函演算,并得到$\mathrm{L}^p$-Hodge分解和Fredholm算子的指标等于全纯Euler示性数。

Comments improvements, 79 pages, submitted

详情
AI中文摘要

我们为紧Kähler流形上具有Hermite全纯向量丛$E$系数的Dolbeault-Dirac算子发展了一个$\mathrm{L}^p$-Banach非交换几何框架。对于每个$p \in (1,\infty)$,我们证明了Dolbeault-Dirac算子的闭$\mathrm{L}^p$-实现$\mathcal{D}_{E,p}$是双扇形的,并且在$\mathrm{L}^p(Ω^{0,ullet}(M,E))$上允许有界$\mathrm{H}^\infty$泛函演算。我们还证明了$\mathrm{L}^p$-Gaffney型估计,得到了$\mathrm{L}^p$-Hodge分解,并证明了$\mathcal{D}_{E,p}$在代数$\mathrm{C}(M)$上(由形式奇偶性分次)产生一个偶紧Banach谱三元组。相关Fredholm算子的指标等于全纯Euler示性数$χ(M,E)$。特别地,它与$p$无关。一个核心工具是$\mathrm{UMD}$ Banach空间上强连续半群的Ricci曲率下界的抽象概念,表述为半群层次的交织关系。在此条件下,结合自然Riesz等价性和相关生成元的有界$\mathrm{H}^\infty$泛函演算,关联的Hodge-Dirac算子是双扇形的并允许有界$\mathrm{H}^\infty$泛函演算。该框架也适用于Riemann流形上的热半群、$q$-Ornstein-Uhlenbeck半群和Schur乘子半群。这为Hilbert空间框架之外的曲率、泛函演算、Riesz变换和指标理论提供了一个统一的Banach空间方法。

英文摘要

We develop an $\mathrm{L}^p$-Banach noncommutative-geometric framework for Dolbeault-Dirac operators on compact Kähler manifolds with coefficients in a Hermitian holomorphic vector bundle $E$. For every $p \in (1,\infty)$, we prove that the closed $\mathrm{L}^p$-realization $\mathcal{D}_{E,p}$ of the Dolbeault-Dirac operator is bisectorial and admits a bounded $\mathrm{H}^\infty$ functional calculus on $\mathrm{L}^p(Ω^{0,\bullet}(M,E))$. We also show an $\mathrm{L}^p$-Gaffney-type estimate, obtain $\mathrm{L}^p$-Hodge decompositions, and prove that $\mathcal{D}_{E,p}$ gives rise to an even compact Banach spectral triple over the algebra $\mathrm{C}(M)$, graded by form parity. The index of the associated Fredholm operator is equal to the holomorphic Euler characteristic $χ(M,E)$. In particular, it is independent of $p$. A central tool is an abstract notion of Ricci curvature lower bound for strongly continuous semigroups on $\mathrm{UMD}$ Banach spaces, formulated as a semigroup-level intertwining relation. Under this condition, together with natural Riesz equivalences and bounded $\mathrm{H}^\infty$ functional calculi for the relevant generators, the associated Hodge-Dirac operator is bisectorial and admits a bounded $\mathrm{H}^\infty$ functional calculus. The framework also applies to heat semigroups on Riemannian manifolds, $q$-Ornstein-Uhlenbeck semigroups and semigroups of Schur multipliers. This provides a unified Banach-space approach to curvature, functional calculus, Riesz transforms and index theory beyond the Hilbert space setting.

2605.20637 2026-06-03 quant-ph

PUBO Formulation for MST and Application to Optimum-Path Forest

MST的PUBO公式及其在最优路径森林中的应用

Guilherme E. L. Pexe, Lucas A. M. Rattighieri, Leandro A. Passos, Danilo S. Jodas, Douglas Rodrigues, Felipe F. Fanchini, João P. Papa, Kelton A. P. Costa

AI总结 提出将最小生成树问题重构为多项式无约束二元优化任务,并利用反馈量子优化算法求解,以解决最优路径森林分类器中大规模数据集的扩展性问题。

Comments 25 pages, 5 figures, 3 tables

详情
AI中文摘要

最优路径森林是一种基于图的框架,用于设计利用样本间连通性的分类器。其中一种变体基于训练数据上的最小生成树计算原型来构建决策边界,这对于大规模数据集可能变得难以处理。在此背景下,量子机器学习已成为克服组合问题高计算负担的有前途的方法。我们提出了一种量子启发式方法,用于OPF分类器中的原型选择,通过将MST问题重构为多项式无约束二元优化任务,并进一步采用基于反馈的量子优化算法进行哈密顿量最小化。PUBO公式减少了量子比特的需求,并消除了辅助变量的需要,从而解决了当前量子硬件中的可扩展性约束。在真实世界数据集上的实验表明,FALQON优化的MST在保持原型质量的同时,实现了与经典Prim算法相当的精度。虽然FALQON偶尔会陷入局部最小值,但这并未显著影响原型选择过程的准确性。

英文摘要

The Optimum-Path Forest is a graph-based framework for designing classifiers that exploit inter-sample connectivity. A particular variant constructs decision boundaries based on prototypes computed by a Minimum Spanning Tree (MST) over the training data, which might become prohibitive for large-scale datasets. In this context, Quantum Machine Learning has emerged as a promising approach to overcome the high computational burden of combinatorial problems. We propose a quantum-inspired approach for prototype selection in OPF classifiers by reformulating the MST problem as a Polynomial Unconstrained Binary Optimization (PUBO) task and further employing the Feedback-Based Quantum Optimization (FALQON) algorithm for Hamiltonian minimization. The PUBO formulation reduces the need for qubits and eliminates the need for auxiliary variables, thereby addressing scalability constraints in current quantum hardware. Experiments on real-world datasets demonstrate that the FALQON-optimized MST achieves accuracies comparable to those of the classical Prim's algorithm while maintaining prototype quality. While FALQON occasionally reached local minima, it did not significantly impact the accuracy of the prototype selection process.

2605.15192 2026-06-03 astro-ph.CO hep-ph hep-th

Isocurvature-Free QCD Axion Dark Matter from Inflaton-Driven Early QCD: the Necessity of Inflationary Plateaus

从暴胀子驱动的早期QCD中无等曲率扰动的QCD轴子暗物质:暴胀平台的必要性

Katherine Freese, Evangelos I. Sfakianakis, Barmak Shams Es Haghi

AI总结 通过暴胀子与胶子的直接耦合在暴胀期间动态提高QCD禁闭标度,抑制轴子等曲率扰动,并利用退禁闭后的德西特涨落产生暗物质,分析表明平台型暴胀模型(p≥2)是必要的,而单式模型(p=1)导致禁闭标度增长过快。

Comments 9 pages, 2 figures; updated discussion of $n_s$ shift

详情
AI中文摘要

暴胀子与标准模型胶子之间的直接耦合可以在暴胀期间动态提高QCD禁闭标度,使轴子暂时变重并抑制轴子等曲率扰动。随着暴胀进行,禁闭标度松弛,轴子变轻,晚期的德西特涨落可以产生观测到的暗物质丰度。我们在不指定暴胀势的情况下分析该机制,而是通过$ε(N) \propto 1/N^p$参数化背景,其中$N$是暴胀结束前的$e$-折叠数。单一参数$p$区分了单式模型($p=1$)、标准平台模型($p=2$)以及超平平台或山顶模型($p\ge 3$)。我们解析地表明,该机制选择了平台型($p\ge 2$)暴胀:单式模型通常导致禁闭标度增长过快,而平台模型使QCD扇区保持在微扰控制之下。在最简情景中,再加热通过相同的暴胀子-胶子耦合实现,当退禁闭发生在CMB窗口之后时,可获得可行的轴子暗物质产生。早期禁闭扇区通常还会将标量谱指数移向更小的红值。由于超平($p\ge 3$)模型固有地预测过红的谱,这一偏移加剧了它们与CMB数据的矛盾,使得$p=2$平台模型成为现象学上可行的参数空间(在此参数化下)。

英文摘要

A direct coupling between the inflaton and Standard Model gluons can dynamically raise the QCD confinement scale during inflation, making the axion temporarily heavy and suppressing axion isocurvature perturbations. As inflation proceeds, the confinement scale relaxes, the axion becomes light, and late-time de Sitter fluctuations can generate the observed dark matter abundance. We analyze this mechanism without specifying an inflationary potential, instead parametrizing the background by $ε(N) \propto 1/N^p$, where $N$ is the number of $e$-folds before the end of inflation. The single parameter $p$ distinguishes monomial models ($p=1$), standard plateau models ($p=2$), and ultra-flat plateau or hilltop-like models ($p\ge 3$). We analytically show that the mechanism selects plateau-like ($p\ge 2$) inflation: monomial models generically cause the confinement scale to grow too rapidly, while plateau models keep the QCD sector under perturbative control. In the minimal scenario, reheating occurs through the same inflaton-gluon coupling, and viable axion dark matter production is obtained when deconfinement occurs after the CMB window. The early-confinement sector also generically shifts the scalar spectral index to smaller, redder values. Because ultra-flat ($p \ge 3$) models inherently predict overly red spectra, this shift exacerbates their tension with CMB data, leaving $p=2$ plateau models as the phenomenologically viable parameter space (in this parametrization).

2602.23554 2026-06-03 cond-mat.str-el

Generic Long-Range Order-Parameter Correlations in Metallic Quantum Magnets

金属量子磁体中序参量关联的普适长程行为

T. R. Kirkpatrick, D. Belitz

AI总结 研究金属磁体中序参量与传导电子耦合导致的零温长程关联,揭示其对不同磁体量子相变性质的影响。

Comments 26pp, 13 figs

Journal ref Phys. Rev. B 113, 214414 (2026)

详情
AI中文摘要

研究表明,在所有类型的金属磁体中,序参量与传导电子的耦合导致零温下序参量磁化率具有长程性。这适用于所有已知的铁磁体,以及反铁磁体和自旋密度波系统、螺旋磁体、磁向列相和交变磁体。对磁量子相变的影响因磁体类型而异。在几乎所有具有均匀磁化的三维系统、磁向列相和交变磁体中,长程关联通常将磁量子相变从二级变为一级。唯一的例外是具有强自旋轨道相互作用的非中心对称铁磁体,其中关联在二维系统中改变相变级数,但在三维系统中不改变。在螺旋磁体、自旋波系统和奈尔反铁磁体中,若序波矢足够大,其影响更弱且不改变相变级数,除非是平带系统。在具有淬灭无序的系统中,相变通常为二级,但关联会改变临界行为。这些结论基于非常简单的考虑,完全依赖于非磁相中的单粒子激发及其由共轭场引起的修正,并结合重整化群分析。

英文摘要

It is shown that in all types of metallic magnets the coupling of the order parameter to the conduction electrons leads to an order-parameter susceptibility that is long-ranged at zero temperature. This is true for all known classes of ferromagnets, and also for antiferromagnets and spin-density wave systems, helimagnets, magnetic nematics, and altermagnets. The consequences for the magnetic quantum phase transition vary between different classes of magnets. In almost all 3-d systems with a homogeneous magnetization, as well as in magnetic nematics and in altermagnets, the long-ranged correlations generically modify the nature of the magnetic quantum phase transition from second order to first order. The only exception are non-centrosymmetric ferromagnets with a strong spin-orbit interaction, where the correlations change the order of the transition in 2-d systems, but not in 3-d ones. In helimagnets, spin-wave systems, and Neel antiferromagnets their effect is even weaker and does not change the order of the transition if the ordering wave number is sufficiently large, except in flat-band systems. In systems with quenched disorder the transition generically is of second order, but the correlations modify the critical behavior. These conclusions are reached by very simple considerations that are based entirely on the single-particle excitations in the nonmagnetic phase and their modifications by a field conjugate to the order parameter, augmented by renormalization-group considerations.

2504.16246 2026-06-03 math.NA cs.NA quant-ph

Projection Coefficients Estimation in Continuous-Variable Quantum Circuits

连续变量量子电路中的投影系数估计

M. W. AlMasri

AI总结 提出一种连续变量量子算法,利用Segal-Bargmann空间与单模量子态之间的等距对应,通过光子数分辨检测和干涉相位参考,从量子态中提取全复振幅的投影系数。

Comments 11 pages; accepted Version

Journal ref Int.J.Theor.Phys 65, 165 (2026)

详情
AI中文摘要

本文提出一种连续变量量子算法,利用Segal-Bargmann空间与单模量子态之间的等距对应,计算全纯函数的投影系数。通过连续变量量子电路,制备与$f(z)$关联的态$\ket{f}$,并通过光子数分辨检测提取系数$c_n = raket{n}{f}$,同时借助干涉相位参考恢复完整的复振幅。我们详细阐述了各类函数的状态制备Oracle的构造,并分析了协议在现实噪声模型(包括探测器非理想性和态制备误差)下的鲁棒性。这使得系数序列的直接量子估计和可视化成为可能——提供了一种硬件原生的协议,用于表征非高斯态和分析由量子Oracle定义的函数,与经典数值积分互补。

英文摘要

In this work, we propose a continuous-variable quantum algorithm to compute the projection coefficients of a holomorphic function in the Segal--Bargmann space by leveraging its isometric correspondence with single-mode quantum states. Using CV quantum circuits, we prepare the state $\ket{f}$ associated with $f(z)$ and extract the coefficients $c_n = \braket{n}{f}$ via photon-number-resolved detection, enhanced by interferometric phase referencing to recover full complex amplitudes. We detail the construction of the state-preparation oracle for various functional classes and analyze the protocol's robustness under realistic noise models, including detector inefficiency and state preparation errors. This enables direct quantum estimation and visualization of the coefficient sequence -- offering a hardware-native protocol for characterizing non-Gaussian states and analyzing functions defined by quantum oracles, complementary to classical numerical integration.

2605.20153 2026-06-03 astro-ph.HE

The exceptional 2017 gamma-ray flare of the radio galaxy NGC 1275: VERITAS and Multiwavelength Observations

射电星系NGC 1275的2017年异常伽马射线耀斑:VERITAS和多波段观测

A. Acharyya, A. Archer, P. Bangale, J. T. Bartkoske, W. Benbow, Y. Chen, J. L. Christiansen, A. J. Chromey, A. Duerr, M. Errando, M. Escobar Godoy, A. Falcone, S. Feldman, Q. Feng, S. Filbert, L. Fortson, A. Furniss, W. Hanlon, O. Hervet, C. E. Hinrichs, J. Holder, Z. Hughes, M. Iskakova, W. Jin, M. N. Johnson, P. Kaaret, M. Kertzman, M. Kherlakian, D. Kieda, T. K. Kleiner, N. Korzoun, F. Krennrich, S. Kundu, M. J. Lang, M. Lundy, G. Maier, E. Meyer, P. Moriarty, R. Mukherjee, W. Ning, M. Ohishi, R. A. Ong, A. Pandey, J. Escudero Pedrosa, M. Pohl, E. Pueschel, J. Quinn, P. L. Rabinowitz, K. Ragan, P. T. Reynolds, D. Ribeiro, E. Roache, C. Rulten, I. Sadeh, L. Saha, M. Santander, G. H. Sembroski, R. Shang, M. Splettstoesser, D. Tak, A. K. Talluri, J. V. Tucci, J. Valverde, V. V. Vassiliev, D. A. Williams, S. L. Wong, T. Yoshikoshi, P. S. Smith, J. Kataoka

AI总结 基于VERITAS和多波段观测,报告了射电星系NGC 1275在2016年底至2017年初的甚高能伽马射线耀斑事件,通过谱能量分布建模支持双成分模型,其中伽马射线发射区靠近C3射电成分。

Comments 24 pages, 9 figures

详情
AI中文摘要

射电星系NGC 1275是英仙座星系团中最亮的星系团星系。它在所有波段都得到了充分研究,包括甚高能(VHE;E>100 GeV)伽马射线,并且过去20年的射电观测追踪到了一个不寻常的射电成分“C3”。NGC 1275在2016年12月31日至2017年1月3日期间处于异常的VHE耀斑状态。根据MAGIC天文台的测量,耀斑峰值达到约1.5蟹状星云单位。我们报告了VERITAS对NGC 1275的观测以及在此耀斑状态期间收集的多波段数据,并提供了2009年至2017年(含)期间的背景数据。VERITAS在2017年1月2日(MJD 57755)和3日(MJD 57756)探测到耀斑的衰减状态,平均流量为0.5蟹状星云单位。VERITAS光谱显示出整体长期趋势:越亮越硬。在耀斑期间,结合Fermi-LAT、MAGIC和VERITAS观测获得的伽马射线光谱从1月1日的具有指数截断的幂律变为1月2日的对数抛物线。为了更详细地研究耀斑的演化,针对2017年1月1日和2日(对应耀斑从峰值到衰减的转变)构建了多波段谱能量分布(SED)。对SED的喷流中团块建模结果支持双成分模型,其中喷流与视线夹角为10度,伽马射线发射区位于C3射电成分附近。

英文摘要

The radio galaxy NGC 1275 is the Brightest Cluster Galaxy in the Perseus cluster. It is well-studied across all wavebands, including Very High Energy (VHE; E>100GeV gamma-rays, and with radio observations over the last 20 years tracking an unusual radio component, "C3". NGC 1275 was observed in an exceptional VHE flaring state between 2016 December 31 and 2017 January 3. The flare peak reached ~1.5 Crab units as measured by the MAGIC observatory. We report on the observations of NGC~1275 conducted by VERITAS and multi-wavelength data collected during this flaring state, and for context, data taken between 2009 and 2017 inclusive. VERITAS detected the declining state of the flare on 2017 January 2 (MJD 57755) and 3 (MJD 57756) at an average flux state of 0.5 Crab units. VERITAS spectra show an overall long-term trend of harder-when-brighter. During the flare, the gamma-ray spectrum obtained from the combined Fermi-LAT, MAGIC, and VERITAS observations, changes from a power law with an exponential cut-off on January 1 to a log-parabola on January 2. To study the evolution of the flare in more detail, multi-band spectral energy distributions (SEDs) were constructed for the nights of 2017 January 1 and 2 corresponding to the shift from the peak to the decline of the flare. A blob-in-jet modeling of the SEDs results in support for a two-component model with a jet angle of 10 degrees to the line of sight and the gamma-ray emission zone located in the vicinity of the C3 radio component.

2605.20008 2026-06-03 math.RA math.GR

Central idempotents in group-graded rings

群分次环中的中心幂等元

Johan Öinert

AI总结 本文研究群分次环中非零中心幂等元的支撑群有限性条件,推广了群环和交叉积中的经典结果,并应用于半群分次环、Leavitt路环等结构。

Comments 11 pages. Minor improvements of the presentation from v1 with the addition of references, Example 3.2 and Remark 3.7

详情
AI中文摘要

设 $G$ 是一个群,$R$ 是一个 $G$-分次环。我们证明,在两种广泛情形下,$R$ 中每个非零中心幂等元具有有限支撑群:当 $G$ 是交换群时,以及当 $G$ 是任意群但分次满足关于非零齐次元素的某种单边非消去条件时。特别地,在相应假设下,若 $G$ 是无挠群,则每个中心幂等元位于分次的主分量中。我们的结果将 H. Bass、R. G. Burns 以及 A. A. Bovdi--S. V. Mihovski 先前从群环和交叉积得到的结果推广到非交换、可能无单位的群分次环。我们通过将结果应用于半群分次环、Leavitt路环、分数斜幺半群环、部分斜群环以及代数 Cuntz-Pimsner 环,展示了其效用。

英文摘要

Let $G$ be a group and let $R$ be a $G$-graded ring. We show that every nonzero central idempotent in $R$ has finite support group in two broad settings: when $G$ is abelian, and when $G$ is arbitrary but the grading satisfies a certain one-sided non-annihilation condition on nonzero homogeneous elements. In particular, under the respective hypotheses, if $G$ is torsion-free, then every central idempotent lies in the principal component of the grading. Our results generalize earlier results by H. Bass, R. G. Burns, and A. A. Bovdi--S. V. Mihovski, from group rings and crossed products, to non-commutative, possibly non-unital, group-graded rings. We demonstrate the utility of our results by applying them to semigroup-graded rings, Leavitt path rings, fractional skew monoid rings, partial skew group rings, and algebraic Cuntz-Pimsner rings.

2605.19860 2026-06-03 physics.chem-ph

A new open-shell CCSDTQ implementation and its application to the basis set convergence of post-CCSDT(Q) corrections in computational thermochemistry

一个新的开壳层CCSDTQ实现及其在计算热化学中后CCSDT(Q)校正的基组收敛性中的应用

Aditya Barman, Gregory H. Jones, Jan M. L. Martin

AI总结 本文扩展了CFOUR中的CCSDTQ实现至UHF和ROHF参考,并应用于W4-08热化学数据集的后CCSDT(Q)校正的基组收敛性研究,发现单次CCCSDTQ(5)Λ-CCSDT(Q)Λ校正最有效,且臭氧的绝热电子亲和能与实验高度一致。

Comments CPL, submitted

详情
AI中文摘要

我们将CFOUR中的CCSDTQ实现扩展到UHF和ROHF参考,并展示了其效率。我们将其应用于W4-08热化学数据集的后CCSDT(Q)校正的基组收敛性。(Q)$_Λ$--(Q)的收敛相对较快。对于困难物种(例如B2、O3),CCSDTQ--CCSDT(Q)$_Λ$可能比(5)$_Λ$收敛更慢,但效应和基组趋势相互抵消。因此,单次CCCSDTQ(5)$_Λ$-CCSDT(Q)$_Λ$校正似乎最有效。对于具有分叉UHF解的自由基,'较少自旋污染'的溶液的能量学明显更稳定。我们计算的最佳臭氧绝热电子亲和能与实验高度一致。

英文摘要

We extend the CCSDTQ implementation in CFOUR to UHF and ROHF references and demonstrate its efficiency. We apply it to basis set convergence of post-CCSDT(Q) corrections for the W4-08 thermochemical dataset. Convergence of (Q)$_Λ$--(Q) is relatively rapid. For difficult species (e.g., B2, O3), CCSDTQ--CCSDT(Q)$_Λ$ may converge more slowly than (5)$_Λ$, but the effects and and basis-set trends oppose each other. Consequently, a single-shot CCCSDTQ(5)$_Λ$-CCSDT(Q)$_Λ$ correction appears most efficient. For radicals with bifurcating UHF solutions, energetics of the `less spin-contaminated' solution are clearly more well-behaved. Our best computed adiabatic electron affinity of ozone is in excellent agreement with experiment.

2509.15022 2026-06-03 cond-mat.mtrl-sci physics.comp-ph

Mapping Microstructure: Manifold Construction for Accelerated Materials Exploration

映射微观结构:用于加速材料探索的流形构建

Simon A. Mason, Megna N. Shah, Jeffrey P. Simmons, Dennis M. Dimiduk, Stephen R. Niezgoda

AI总结 提出将微观结构视为随机过程并映射到低维材料流形的方法,通过相场模拟验证了分布描述符能恢复与工艺参数对齐的二维潜在结构,实现可逆且物理可解释的工艺-结构映射。

详情
AI中文摘要

加速材料开发需要建立加工、微观结构和性能之间的定量联系。在这项工作中,我们引入了一个框架,将微观结构映射到由加工条件参数化的低维材料流形上。一个关键创新是将微观结构视为随机过程,定义为微观结构实例的分布而非单一图像,从而能够提取捕捉关键工艺依赖性特征的材料状态描述符。我们利用流形假设,认为微观结构结果位于仅由少数参数控制的低维潜在空间中。使用旋节线分解的相场模拟作为模型材料系统,我们根据两个标准比较了多种微观结构描述符(两点统计、弦长分布和持续同调):(1) 潜在空间的内在维度,(2) 工艺-结构映射的可逆性。结果表明,基于分布的描述符能够恢复与真实工艺参数对齐的二维潜在结构,从而在工艺和微观结构之间产生可逆且物理可解释的映射。相比之下,不考虑微观结构变异性的描述符要么高估维度,要么失去预测保真度。构建的材料流形被证明是局部连续的,其中工艺变量的微小变化对应于微观结构描述符的平滑变化。这种数据驱动的流形映射方法为基于微观结构的工艺设计提供了定量基础,并为在集成材料工程背景下实现工艺-结构-性能关系的闭环优化铺平了道路。

英文摘要

Accelerating materials development requires quantitative linkages between processing, microstructure, and properties. In this work, we introduce a framework for mapping microstructure onto a low-dimensional material manifold that is parametrized by processing conditions. A key innovation is treating microstructure as a stochastic process, defined as a distribution of microstructural instances rather than a single image, enabling the extraction of material state descriptors that capture the essential process-dependent features. We leverage the manifold hypothesis to assert that microstructural outcomes lie on a low-dimensional latent space controlled by only a few parameters. Using phase-field simulations of spinodal decomposition as a model material system, we compare multiple microstructure descriptors (two-point statistics, chord-length distributions, and persistent homology) in terms of two criteria: (1) intrinsic dimensionality of the latent space, and (2) invertibility of the processing-to-structure mapping. The results demonstrate that distribution-based descriptors can recover a two-dimensional latent structure aligned with the true processing parameters, yielding an invertible and physically interpretable mapping between processing and microstructure. In contrast, descriptors that do not account for microstructure variability either overestimate dimensionality or lose predictive fidelity. The constructed material manifold is shown to be locally continuous, wherein small changes in process variables correspond to smooth changes in microstructure descriptors. This data-driven manifold mapping approach provides a quantitative foundation for microstructure-informed process design and paves the way toward closed-loop optimization of processing--structure--property relationships in an integrated materials engineering context.

2605.19472 2026-06-03 astro-ph.SR

Chromospheric resonator model for sunspot revealed by multi-height observation of umbral wave

太阳黑子色球谐振器模型:基于本影波多高度观测的揭示

Kartika Sangal, A. K. Srivastava, Libo Fu, Ding Yuan, Song Feng, Yuandeng Shen

AI总结 利用多波长高分辨率观测,通过分析Hα线强度与多普勒速度的相位关系,发现太阳黑子本影波表现为慢磁声驻波和上行传播波,并受限于非理想声学谐振器,为黑子地震学提供可测量波参数。

Comments Accepted for publication in Monthly Notices of the Royal Astronomical Society

Journal ref Mon Not R Astron Soc (2026)

详情
AI中文摘要

太阳黑子是瞬态的、磁密集的特征,其振荡与磁流体动力学(MHD)波相关。这些波可能有助于等离子体加热并驱动太阳风中的质量流。除了能量作用外,它们还作为探测黑子结构的诊断工具。在本研究中,我们利用大熊湖太阳观测站古德太阳望远镜的高分辨率多波长观测,研究了太阳黑子中的色球波传播。光谱分析显示,Hα线芯及其翼的强度在约3分钟处表现出振荡信号。我们进行了交叉小波分析,以检查Hα线的翼积分和线芯强度振荡与质心衍生的Hα多普勒速度之间的相位关系。我们还分析了Hα线不同通带组合的强度对之间的相位关系。结果表明,存在慢磁声模式,表现为驻波以及向上传播的波。观察到的相位模式表明,本影波被限制在一个非理想声学谐振器内,提供了可测量的波特性,可作为黑子地震学的输入,并改进黑子大气结构模型。

英文摘要

Sunspots are transient, magnetically intense features that host oscillations linked to magnetohydrodynamic (MHD) waves. These waves may contribute to plasma heating and drive mass flows in the solar wind. Beyond their energetic role, they serve as diagnostic tools for probing sunspot structure. In this study, we investigated chromospheric wave propagation in a sunspot using high-resolution, multi-wavelength observations from the Goode Solar Telescope at Big Bear Solar Observatory. Spectral analysis shows that the intensity at H$α$ line core and its wings exhibited oscillatory signal at about 3 min. We performed a cross-wavelet analysis to examine the phase relationship between the wing-integrated and line-core intensity oscillations of the H$α$ line and the centroid-derived H$α$ Doppler velocity. We also analyze the phase relationships between intensity pairs from different passband combinations of the H$α$ line. The results indicate the presence of slow magnetoacoustic modes manifesting standing waves along with upward propagating waves. The observed phase patterns suggest that umbral waves are confined within a non-ideal acoustic resonator, providing measurable wave properties that could serve as input for sunspot seismology and refine models of sunspot atmospheric structure.

2605.07734 2026-06-03 hep-th cond-mat.str-el hep-ph math-ph math.MP

Characterizing gapped phases by smeared boundary conformal field theories: Duality in unusual ordering with spontaneously broken generalized symmetries

通过涂抹边界共形场论刻画能隙相:自发破缺广义对称性的非常规序中的对偶性

Yoshiki Fukusumi, Shuma Nakashiba

AI总结 本文通过结合Higgs/Nambu-Goldstone型论证与涂抹边界共形场论,研究质量间隙相的对偶分类,揭示了质量间隙相可能超出边界临界现象范畴,并自发破缺非群状(不可逆)对称性。

Comments 4 figures, 2 tables. Typos have been corrected, and references have been added (v2). The title has been modified, and a figure has been added (v3)

详情
AI中文摘要

我们研究了在耦合常数符号变化下,与无质量RG流对偶的质量间隙相或质量重整化群流的分类。尽管我们的形式基于将Higgs或Nambu-Goldstone型论证与Cardy的涂抹边界共形场论相结合,但仍出现了一些令人困惑的结构。更具体地说,关于对偶性的已建立的Higgs或Nambu-Goldstone型论证表明,间隙态的自然基应由一组涂抹的Ishibashi态构成,而这些态在边界临界现象中是非物理的。因此,间隙相的模可以超出边界临界现象的范畴,但我们仍可通过将SBCFT应用于模型来计算表征量。例如,我们证明了从三临界Ising模型到Ising模型(最简单的无质量RG流之一)的无质量RG流对偶的质量RG流具有这种非常规结构。这可以视为晶格模型中序-无序共存的量子场论类比。更一般地,由此产生的间隙相通常自发破缺非群状对称性(或不可逆对称性)。我们的工作为这类具有非群状(或不可逆)对称性自发破缺的非常规相提供了系统的量子场论描述。

英文摘要

We study the classification of the gapped phases or massive renormalization group (RG) flows dual to the massless RG flows under changing the sign of the coupling constants. Whereas our formalism is based on combining Higgs- or Nambu-Goldstone-type arguments with Cardy's smeared boundary conformal field theories (SBCFTs), several puzzling structures arise. More specifically, the established Higgs or Nambu-Goldstone type arguments on the duality imply that the natural basis for the gapped states should be constructed from a set of smeared Ishibashi states, which are unphysical in boundary critical phenomena. Hence, the module of the gapped phases can be outside of that of boundary critical phenomena, whereas one can still calculate characterizing quantities by applying SBCFTs to the models. For example, we demonstrate that the massive RG flow dual to the massless RG flow from the tricritical Ising model to the Ising model, one of the simplest massless RG flows, has this unusual structure. This can be regarded as a quantum field-theoretic analogue of order-disorder coexistence in lattice models. More generally, the resultant gapped phases usually spontaneously break non-group-like symmetry (or noninvertible symmetry). Our work provides systematic quantum field theoretic descriptions of such unusual phases with spontaneous symmetry breaking of non-group-like (or noninvertible) symmetries.

2512.11309 2026-06-03 astro-ph.GA

Kennicutt-Schmidt relation of galaxies over 13 billion years in the COLIBRE hydrodynamical simulations

COLIBRE流体动力学模拟中130亿年星系的Kennicutt-Schmidt关系

Claudia del P. Lagos, Joop Schaye, Matthieu Schaller, Danail Obreschkow, Yannick M. Bahe, Alejandro Benitez-Llambay, Evgenii Chaikin, Camila Correa, Timothy A. Davis, Carlos S. Frenk, Filip Husko, Melanie Kaasinen, Robert J. McGibbon, Kyle Oman, Sylvia Ploeckinger, Alexander J. Richings, James W. Trayford, Jing Wang, Ruby J. Wright

AI总结 利用COLIBRE宇宙学流体动力学模拟,研究星系在红移0到8范围内的恒星形成率面密度与气体面密度(KS关系)的关联,发现HI KS关系在低质量星系中更陡,H2消耗时间随红移增加而减少约20倍,且与观测吻合。

Comments 27 pages; 19 main body of the paper. Accepted for publication MNRAS after minor revisions

Journal ref Mon Not R Astron Soc (2026)

详情
AI中文摘要

我们利用最先进的COLIBRE宇宙学流体动力学模拟,研究了恒星质量大于$10^9\, m M_{\odot}$的星系在宇宙时间($0\le z \le 8$)内、千秒差距尺度上的恒星形成率(SFR)面密度与气体面密度之间的相关性(称为Kennicutt-Schmidt,KS关系)。这些模拟采用了随动的非平衡化学模型,耦合了尘埃演化以及低至约10 K的详细辐射冷却,从而能够直接预测原子(HI)和分子(H$_2$)的KS关系。在$z\approx 0$时,COLIBRE再现了观测到的(空间分辨的)HI和H$_2$的KS关系,包括相关的弥散,我们预测该弥散与恒星面密度、局部比SFR(sSFR)和气体金属丰度显著相关。我们表明,低质量星系的HI KS关系更陡,而具有较高sSFR的星系中H$_2$ KS关系向更高的归一化偏移。H$_2$消耗时间从$z = 0$到$z = 8$减少了约20倍,这主要是由于气相金属丰度的降低。这导致在高红移时,给定SFR对应的H$_2$更少而HI更多。我们还发现,具有较高sSFR的星系在千秒差距尺度上具有更高的分子气体含量和更高的单位气体质量恒星形成效率。预测的H$_2$消耗时间演化及其与星系sSFR的相关性,在宽红移范围$0\le z\le 5$内与观测结果吻合得非常好。

英文摘要

We investigate the correlation between star formation rate (SFR) surface density and gas surface density (known as the Kennicutt-Schmidt, KS, relation) at kiloparsec (kpc) scales across cosmic time ($0\le z \le 8$) for galaxies with stellar masses $>10^9\,\rm M_{\odot}$, using the COLIBRE state-of-the-art cosmological hydrodynamical simulations. These simulations feature on-the-fly non-equilibrium chemistry coupled to dust grain evolution and detailed radiative cooling down to $\approx 10$~K, enabling direct predictions for the atomic (HI) and molecular (H$_2$) KS relations. At $z\approx 0$, COLIBRE reproduces the observed (spatially-resolved) KS relations for HI and H$_2$, including the associated scatter, which we predict to be significantly correlated with stellar surface density, local specific SFR (sSFR), and gas metallicity. We show that the HI KS relation steepens for lower-mass galaxies, while the H$_2$ KS relation shifts to higher normalisation in galaxies with higher sSFRs. The H$_2$ depletion time decreases by a factor of $\approx 20$ from $z = 0$ to $z = 8$, primarily due to the decreasing gas-phase metallicity. This results in less H$_2$ and more HI being associated with a given SFR at higher redshift. We also find that galaxies with higher sSFRs have a larger molecular gas content and higher star formation efficiency per unit gas mass on kpc scales. The predicted evolution of the H$_2$ depletion time and its correlation with a galaxy's sSFR agree remarkably well with observations in a wide redshift range, $0\le z\le 5$.

2409.10613 2026-06-03 astro-ph.GA

Exploring the interplay between star formation efficiency and dust in regulating the UV luminosity of early systems in the JWST and ALMA era

探索恒星形成效率与尘埃在调控JWST和ALMA时代早期系统紫外光度中的相互作用

Georgios Panagiotis Nikopoulos, Pratika Dayal

AI总结 通过解析模型联合研究爆发式恒星形成及其尘埃增丰对早期星系紫外光度函数的影响,解释了JWST观测到的z~9-16.5星系候选体过剩现象,并给出了恒星形成效率随红移演化的关系。

Comments 12 pages (+1 page appendix), 7+1 figures, accepted by MNRAS 06.05.2026

Journal ref Mon Not R Astron Soc (2026)

详情
AI中文摘要

詹姆斯·韦伯望远镜(JWST)的观测揭示了大量红移$z \sim 9 - 16.5$的星系候选体,暗示在$z \gsim 11$时紫外光度函数(UV LF)亮端存在源过剩。同时,阿塔卡马大型毫米波/亚毫米波阵列(ALMA)已在$z \sim 5 - 7$获得了尘埃质量估计。在这项工作中,我们发展了一个以ALMA结果为基准的解析形式体系,联合探索爆发式恒星形成及其伴随的尘埃增丰对早期星系可见性的影响,同时模拟了从主序星形成中散射出来的源。我们考虑了II型超新星中的尘埃产生、尘埃破坏、抛射、增长和溅射。我们的主要结果是:(i)解释$z \sim 5 - 13$的UV LF需要平均恒星形成效率演化为$f_*(z) = 10^{0.13z-3.5}$,且许多观测值超过此主序达10倍;(ii)早期系统的尘埃增丰由SNII抛射物中的尘埃产生驱动,而在$z \sim 7$时,增长和溅射分别对尘埃质量产生60%和40%的影响;(iii)$z \gsim 9$的星系可以保留显著的尘埃,在$z \sim 9$($z \sim 11$)时达到平均尘埃-恒星质量比0.19%(0.14%)。尘埃消光随红移增加而减小,因为尘埃在晕中变得更加分散;(iv)ALMA在$z \sim 5$和7的观测并不代表构成UV LF的平均星系群;(v)假设所有恒星瞬时形成会导致高的光质比。这自然导致我们的模型给出了晕中恒星质量的下限,同时也低估了观测到的恒星质量函数。

英文摘要

James Webb Telescope (JWST) observations have unveiled numerous galaxy candidates between $z \sim 9 - 16.5$, hinting at an over-abundance of sources at the bright-end of the UV luminosity function (UV LF) at z $\gsim$ 11. Complementarily, the Atacama Large Millimetre Array (ALMA) has been yielding dust mass estimates at $z \sim 5 - 7$. In this work, we develop an analytic formalism baselined against ALMA results, jointly exploring the impact of bursty star formation and its associated dust enrichment, on the visibility of early galaxies, while also modelling sources scattered off the main sequence of star formation. We incorporate dust production in type II Supernovae, dust destruction, ejection, growth and sputtering. Our key results are: (i) explaining the UV LF at $z \sim 5 - 13$ requires an average star formation efficiency that evolves as $f_*(z) = 10^{0.13z-3.5}$, with a number of observations exceeding this main sequence by a factor of 10; (ii) The dust enrichment of early systems is driven by dust production in SNII ejecta, while growth and sputtering impact the dust mass by 60\% and 40\% respectively at $z \sim 7$; (iii) galaxies at $z \gsim 9$ can retain significant dust, reaching average dust-to-stellar mass ratios of 0.19\% (0.14\%) at $z \sim 9$ ($z \sim 11$). Dust attenuation decreases with redshift as dust becomes increasingly dispersed within halos; (iv) observations by ALMA at $z \sim 5$ and 7 are not representative of the average population that makes up the UV LF; (v) assuming all stars to have formed instantaneously results in a high light-to-mass ratio. This naturally results in our model yielding a lower limit on the stellar mass contained in a halo, also under-predicting the observed stellar mass function.

2605.18952 2026-06-03 hep-th

A missing link: Brane networks and the Cobordism Conjecture

缺失的一环:膜网络与配边猜想

Markus Dierigl, Ignacio Ruiz

AI总结 本文研究量子引力中离散对称性破缺缺陷,发现其自然描述为余维二对象网络而非孤立余维三对象,从而扩展了配边猜想的适用范围,并在弦/M理论导出的四维超引力中验证。

Comments 24 pages plus appendices, 14 figures. New references and comments added

详情
AI中文摘要

量子引力理论中全局对称性的缺失通常需要引入(新的)对称性破缺缺陷,这些缺陷在低能描述中表现为奇异对象。这已被形式化为配边猜想,该猜想进一步将这些缺陷的渐近行为与有效理论的非平凡形变类联系起来。在本文中,我们研究了具有离散对称性$G$的理论中的对称性破缺缺陷,该对称性编码在配边群$Ω^ξ_2 (BG)$中,特别是用同调群$H_2(BG;\mathbb{Z})$描述的子类。与预期相反,我们发现这些缺陷自然地描述为余维二对象的网络,而不是余维三的孤立对象。虽然在特殊情况下,缺陷的链接构型就足够了,但我们的策略通常预测了连接点的存在,从而暗示了配边猜想的更广泛应用。我们通过源自弦理论和M理论、具有离散海森堡群作用在其轴子自由度上的四维超引力理论,证明了这种方法的可行性。

英文摘要

The absence of global symmetries in a quantum gravity theory often requires the introduction of (new) symmetry-breaking defects, which appear as singular objects in the low-energy description. This has been formalized in the Cobordism Conjecture, which further relates the asymptotics of these defects to non-trivial deformation classes of the effective theory. In this work we investigate the symmetry-breaking defects for theories with a discrete symmetry $G$ encoded in the bordism groups $Ω^ξ_2 (BG)$ and, in particular, its sub-class described in terms of the homology groups $H_2(BG;\mathbb{Z})$. Contrary to expectations we find that the defects are naturally described in terms of networks of codimension-two objects rather than isolated objects in codimension three. While in special situations linking configurations of defects are sufficient, our strategy generically predicts the existence of junctions, thus suggesting an extended applicability of the Cobordism Conjecture. We demonstrate the viability of this approach in four-dimensional supergravity theories originating from string and M-theory with a discrete Heisenberg group acting on its axionic degrees of freedom.

2605.18546 2026-06-03 cond-mat.quant-gas

Bilayer crystals in a polar-molecules system

极性分子体系中的双层晶体

Vinicius Zampronio, Matteo Ciardi, Fabio Cinti

AI总结 利用量子蒙特卡洛模拟,研究极性分子在准二维谐波势阱中的有限温度相图,发现通过调节温度和束缚强度可形成包括双层晶体在内的多种量子相,揭示了热涨落对偶极体系结晶的促进作用。

Comments 7 pages and 6 figures

详情
AI中文摘要

我们研究了沿极化轴方向受谐波势约束的极性分子在准二维几何中的有限温度相图。采用量子蒙特卡洛模拟探索当前实验装置可及的强关联区域。通过调节温度和束缚强度,我们识别出丰富的相态,包括正常流体、超流体、超固体、团簇晶体和双层晶体态。我们的结果揭示了随温度升高而出现的结晶现象,突出了热涨落在偶极体系中的非平凡作用。特别地,我们展示了通过固定相互作用下改变束缚强度,可以稳定每个格点一个分子的双层晶体。此外,我们展示了具有两层间相位相干性的超流体态的分层证据。这些发现提供了对低维偶极体系中相互作用、束缚和温度之间相互作用的见解,并为利用超冷极性分子设计量子相指明了新方向。

英文摘要

We investigate the finite-temperature phase diagram of polar molecules confined in a quasi-two-dimensional geometry by a harmonic potential along the polarization axis. We employ Quantum Monte Carlo simulations to explore the strongly correlated regime accessible with current experimental setups. By tuning temperature and confinement strength, we identify a rich set of phases, including normal fluid, superfluid, supersolid, cluster crystal, and bilayer crystal states. Our results reveal the emergence of crystallization upon increasing temperature, highlighting the nontrivial role of thermal fluctuations in dipolar systems. In particular, we show that a bilayer crystal with one molecule per lattice site can be stabilized by varying the confinement strength at fixed interaction. Moreover, we show evidence of layering of superfluid states with phase coherence between the two layers. These findings provide insight into the interplay between interactions, confinement, and temperature in low-dimensional dipolar systems, and suggest new directions for engineering quantum phases with ultracold polar molecules.

2605.18469 2026-06-03 math.AG

Picard bundles and the degree of irrationality of Jacobians and Pryms

Picard丛与Jacobians和Pryms的非理性度

Federico Moretti, Andrés Rojas

AI总结 通过研究光滑射影曲线上对称积上秩g的(扭曲)Picard丛的正性性质,证明了任意亏格g的Jacobian的非理性度上界为2^g,任意(g-1)维Prym簇的非理性度上界为2^{2g-3}。

Comments Second version, with a new section on Prym varieties. The title has been changed accordingly

详情
AI中文摘要

对于亏格为$g$的光滑射影曲线,我们研究了$g$重对称积上(扭曲的)秩$g$ Picard丛的一些正性性质。作为应用,我们证明了任意亏格$g$的Jacobian的非理性度上界为$2^g$,任意$(g-1)$维Prym簇的非理性度上界为$2^{2g-3}$。

英文摘要

For a smooth projective curve of genus $g$, we study some positivity properties of (twisted) rank-$g$ Picard bundles on the $g$-fold symmetric product. As an application, we prove that the degree of irrationality of any genus $g$ Jacobian is bounded from above by $2^g$, and the degree of irrationality of any $(g-1)$-dimensional Prym variety is bounded from above by $2^{2g-3}$.

2605.11701 2026-06-03 math.OA math.FA

Relative Kubo-Ando Means of Completely Positive Maps

完全正映射的相对Kubo-Ando均值

Mohsen Kian

AI总结 本文利用Arveson的Radon-Nikodym定理,为受同一环境映射支配的完全正映射定义了相对Kubo-Ando均值,并证明了其序理论性质、几何均值的块正定性刻画以及与现有方法的等价性。

Comments This paper has been withdrawn by the author due to discovering overlap with the recent literature. The manuscript is currently being fundamentally restructured to focus on the ambient independence of relative operator connections

详情
AI中文摘要

我们在完全正映射的序区间上发展了Kubo-Ando理论。利用Arveson的Radon-Nikodym定理作为结构工具,我们定义了受共同环境映射\(\Omega\)支配的完全正映射的相对Kubo-Ando均值\(\Phi \sigma_\Omega \Psi\)。特殊选择\(\Omega = \Phi + \Psi\)给出了两个完全正映射的内在均值。我们证明这些均值独立于所选的Stinespring表示,并满足预期的序理论性质,包括单调性、变换不等式、Jensen型不等式、数据处理以及关于环境映射的单调性。对于几何均值,我们得到了块正定性刻画,并表明当两个映射没有非零的共同完全正子映射时,内在几何均值恰好为零。最后,我们将该构造与现有的有限维和形式理论方法进行比较:对于矩阵代数之间的映射,它与Choi矩阵均值一致;在几何情形下,它与Okayasu的Pusz-Woronowicz均值在其公共定义域上一致。

英文摘要

We develop a Kubo--Ando theory on order intervals of completely positive maps. Using Arveson's Radon--Nikodym theorem as a structural tool, we define relative Kubo--Ando means \(Φσ_ΩΨ\) for completely positive maps dominated by a common ambient map \(Ω\). The special choice \(Ω=Φ+Ψ\) yields an intrinsic mean of two completely positive maps. We prove that these means are independent of the chosen Stinespring representation and satisfy the expected order-theoretic properties, including monotonicity, transformer inequalities, Jensen-type inequalities, data processing, and monotonicity with respect to the ambient map. For the geometric mean, we obtain a block-positivity characterization and show that the intrinsic geometric mean vanishes exactly when the two maps have no nonzero common completely positive submap. Finally, we compare the construction with existing finite-dimensional and form-theoretic approaches: for maps between matrix algebras it agrees with the Choi-matrix mean, and in the geometric case it agrees with Okayasu's Pusz--Woronowicz mean on their common domain.

2512.21175 2026-06-03 cond-mat.soft

Multi-Tau Pulsed Illumination Differential Dynamic Microscopy with 80 $μ$s Resolution

80 μs分辨率的多τ脉冲照明差分动态显微镜

Emmanuel Schaub, Martinus H. V. Werts

AI总结 提出多τ脉冲照明差分动态显微镜(MTPI-DDM),通过几何级数时序和脉冲LED照明,将时间分辨率提升至80 μs,并消除运动模糊,验证了147 nm聚苯乙烯纳米颗粒在水中的扩散。

Comments Main text: 7 pages, 5 figures, 1 table. Supplementary information: 5 pages, 4 figures, 1 table

Journal ref Rev. Sci. Instrum. 97, 063702 (2026)

详情
AI中文摘要

差分动态显微镜(DDM)是一种用于定量测量软凝聚态物质系统中微观动力学的数字视频显微镜技术。本文引入多τ脉冲照明DDM(MTPI-DDM)作为显著提高DDM时间分辨率的方法。该技术采用简单、低成本的仪器,包括单个单色数码相机和单个脉冲LED。采用几何级数时间延迟的时序生成“多τ”方案,在动力学最快的短时间尺度上提供高采样密度。在当前实现中,达到了80 μs的时间分辨率,受限于相机电子设备的死区时间。通过测量147 nm聚苯乙烯纳米颗粒在水中的扩散,对MTPI-DDM进行了验证。与传统的连续波(CW)DDM相比,脉冲方法将最短可测时间延迟的范围扩展了近两个数量级,并通过消除运动模糊增强了DDM信号幅度。

英文摘要

Differential dynamic microscopy (DDM) is a digital video-microscopy technique for quantitative measurements of the microscale dynamics in soft condensed matter systems. Here, multi-tau pulsed illumination DDM (MTPI-DDM) is introduced as a method for significantly enhancing the time resolution of DDM. The technique employs simple, low-cost instrumentation comprising a single monochrome digital camera and a single pulsed LED. A timing sequence, following a geometric progression of time lags, is used to generate a "multi-tau" scheme, providing high sampling density at short timescales where dynamics are fastest. In the current implementation, a time resolution of 80 $μ$s is achieved, limited by the dead time of the camera electronics. Validation of MTPI-DDM was performed by measuring the diffusion of 147 nm polystyrene nanoparticles in water. Compared to conventional continuous-wave (CW) DDM, the pulsed approach extends the range of the shortest measurable time lags by nearly two orders of magnitude and enhances DDM signal amplitudes by eliminating motion blur.

2511.19614 2026-06-03 astro-ph.GA astro-ph.IM

SE3D: Testing the recovery of stellar population, dust and structural properties on mock-observed toy model and simulated galaxies

SE3D: 在模拟观测的玩具模型和模拟星系上测试恒星种群、尘埃和结构性质的恢复

Junkai Zhang, Steven Ramnichal, Stijn Wuyts, Cheng Li

AI总结 本文通过联合拟合多波段测光和结构性质的模拟观测,测试了基于辐射传输仿真器的SE3D框架恢复星系内在性质(如恒星质量、尘埃质量、恒星形成率及其径向范围)的能力,并分析了模型失配的影响。

Comments Accepted by MNRAS. 20 pages, 12 figures, 3 tables

Journal ref Mon Not R Astron Soc (2026)

详情
AI中文摘要

从直接观测量到星系物理性质的转换是重建其演化历史的关键步骤。恒星-尘埃几何和不均匀的恒星种群会导致质光比的空间变化,使这一过程复杂化。在本文中,我们介绍了对SE3D的测试,这是一个围绕辐射传输仿真器构建的新型建模框架,旨在解决这一问题。我们通过联合拟合玩具模型和TNG50模拟星系的多波段测光和结构性质的模拟观测,测试了恢复已知内在性质的能力。我们发现对于几个关键特征,包括整体恒星质量、尘埃质量和恒星形成率,以及它们各自的径向范围,性能令人鼓舞($\lesssim$ 0.1 dex)。我们指出了局限性,并研究了各种模型失配来源的影响。其中,恒星形成历史形状的失配贡献最大,而径向和方位角结构以及恒星金属丰度分布的作用逐渐减小。我们还分析了TNG星系从z=2到z=0的解析恒星和尘埃性质的演化,这些性质是内在测量的,并表达在UVJ和IRX-$β$诊断图中的分布。我们测试了将尘埃分配给模拟的不同方法,并发现与观测相比,尘埃质量与恒星质量比缺乏演化,且在诊断图中的动态范围更有限。

英文摘要

The translation from direct observables to physical properties of galaxies is a key step in reconstructing their evolutionary histories. Star-dust geometry and inhomogeneous stellar populations can induce spatial variations in the mass-to-light ratio, complicating this process. In this paper, we present tests of SE3D, a novel modelling framework built around a radiative transfer emulator, aimed at tackling this problem. We test the ability to recover known intrinsic properties of toy model and TNG50 simulated galaxies by jointly fitting mock observations of their multi-wavelength photometric and structural properties. We find an encouraging performance ($\lesssim$ 0.1 dex) for several key characteristics, including the bulk stellar mass, dust mass and SFR, as well as their respective radial extents. We point out limitations, and investigate the impact of various sources of model mismatch. Among them, mismatch in the shapes of star formation histories contributes most, with radial and azimuthal structure and stellar metallicity distributions playing a progressively more minor role. We also analyse the evolution from z=2 to z=0 of resolved stellar and dust properties of TNG galaxies, as measured intrinsically and expressed in their distribution across UVJ and IRX-$β$ diagnostic diagrams. We test different methods to assign dust to the simulation, and find a persistent lack of Mdust/Mstar evolution and a more limited dynamic range across the diagnostic diagrams compared to observations.

2407.06968 2026-06-03 cs.LO cs.FL

An automata-based approach for synchronizable mailbox communication

基于自动机的同步邮箱通信方法

Romain Delpy, Anca Muscholl, Grégoire Sutre

AI总结 本文通过自动机方法研究了无大小限制轮次下邮箱通信系统的同步性判定问题,证明该问题为PSPACE完全。

Journal ref Logical Methods in Computer Science, Volume 22, Issue 2 (May 27, 2026) lmcs:14979

详情
AI中文摘要

我们重新研究了在邮箱语义下具有轮次通信的有限状态通信系统。邮箱对应每个进程一个FIFO缓冲区(而不是像点对点系统中每对进程一个缓冲区)。轮次通信对应于一系列轮次,其中进程可以先发送消息,然后仅接收(并且接收必须与其发送在同一轮次中)。如果一个系统的每个执行都可以重新调度为一个等价的轮次序列,则称该系统为可同步的。先前的工作主要考虑轮次大小固定的情况。我们的主要贡献表明,在轮次无大小限制的情况下,邮箱通信系统是否符合轮次策略的问题是PSPACE完全的。为此,我们采用了一种新颖的基于自动机的方法,该方法还可以确定先前文献中考虑的若干问题的精确复杂度(PSPACE)。

英文摘要

We revisit finite-state communicating systems with round-based communication under mailbox semantics. Mailboxes correspond to one FIFO buffer per process (instead of one buffer per pair of processes in peer-to-peer systems). Round-based communication corresponds to sequences of rounds in which processes can first send messages, then only receive (and receives must be in the same round as their sends). A system is called synchronizable if every execution can be re-scheduled into an equivalent execution that is a sequence of rounds. Previous work mostly considered the setting where rounds have fixed size. Our main contribution shows that the problem whether a mailbox communication system complies with the round-based policy, with no size limitation on rounds, is Pspace-complete. For this we use a novel automata-based approach, that also allows to determine the precise complexity (Pspace) of several questions considered in previous literature.

2505.05964 2026-06-03 quant-ph

Catalytic entanglement transformations with noisy hardware

含噪硬件下的催化纠缠变换

Hemant Sharma, Aleksandr Mokeev, Jonas Helsen, Johannes Borregaard

AI总结 研究在噪声环境下,利用催化剂态提升纠缠浓缩效率,提出一种新的POVM确定方法,并数值比较催化与非催化纠缠浓缩及蒸馏的性能。

Comments 17 pages, 6 figures

Journal ref Quantum 10, 2117 (2026)

详情
AI中文摘要

某些纠缠资源态(催化剂态)的可用性可以提高将几个较少纠缠态转化为更少高度纠缠态的速率,这一过程称为催化纠缠浓缩(EC)。在这里,我们将催化EC从纯态扩展到混合态,并在存在态制备误差和操作误差的情况下,将其与非催化EC和蒸馏进行数值基准测试。此外,我们分析了在这种误差下催化剂的可重复使用性。为此,我们引入了一种新的方法来确定EC变换所需的正算子值测量(POVM),该方法允许在通信轮数和所需辅助量子比特数之间进行权衡。我们发现,在低操作误差和退极化噪声存在的情况下,催化EC可以提供比蒸馏和非催化EC更好的速率。

英文摘要

The availability of certain entangled resource states (catalyst states) can enhance the rate of converting several less entangled states into fewer highly entangled states in a process known as catalytic entanglement concentration (EC). Here, we extend catalytic EC from pure states to mixed states and numerically benchmark it against non-catalytic EC and distillation in the presence of state-preparation errors and operational errors. Furthermore, we analyse the re-usability of catalysts in the presence of such errors. To do this, we introduce a novel recipe for determining the positive-operator valued measurements (POVM) required for EC transformations, which allows for making tradeoffs between the number of communication rounds and the number of auxiliary qubits required. We find that in the presence of low operational errors and depolarising noise, catalytic EC can provide better rates than distillation and non-catalytic EC.

2605.05249 2026-06-03 cs.IR

TriAlignGR: Triangular Multitask Alignment with Multimodal Deep Interest Mining for Generative Recommendation

TriAlignGR:面向生成式推荐的多模态深度兴趣挖掘与三角多任务对齐

Yangchen Zeng, Hao Peng, Rongfeng Guo, Zhenyu Yu, Zhiyuan Hu, Jinze Wang

AI总结 提出TriAlignGR统一多任务多模态框架,通过两阶段语义传播和三角多任务对齐,解决语义ID中的内容退化与语义不透明问题,实现生成式推荐。

详情
AI中文摘要

我们提出TriAlignGR,一个用于生成式推荐的统一多任务多模态框架,它建立了两阶段多模态语义传播:(i) 通过多模态嵌入将视觉语义直接编码到SID中,以及(ii) 使模型能够通过视觉描述任务解码这些语义。现有的语义ID(SID)流程存在两个基本但未被充分探索的问题: extbf{SID内容退化(SCD)},其中级联编码和残差量化丢弃了关键的多模态和兴趣级语义;以及 extbf{SID语义不透明(SSO)},其中模型自回归生成SID序列而没有真正理解其底层含义,导致幻觉和泛化能力差。先前的工作最多处理文本-SID对齐,完全未利用视觉语义和潜在用户兴趣。TriAlignGR通过三个紧密集成的组件解决了这两个问题:(1)~ extbf{跨模态语义对齐(CMSA)}通过VLM生成的文本描述和直接编码图像特征与文本的多模态嵌入模型,将视觉内容整合到SID构建中,确保SID固有地携带多模态语义;(2)~ extbf{多模态深度兴趣挖掘(MDIM)}利用LLM链式思维推理提取超越表面属性的潜在用户意图(例如,从降噪耳机中提取“以生产力为中心的生活方式”),在离散化之前丰富SID语义;以及(3)~ extbf{三角多任务(TMT)}在单个自回归损失下联合训练八个互补的生成任务——包括两个新颖的视觉语义任务(VisDesc→SID,VisDesc→Title),将VLM生成的图像描述映射到SID和标题,完成SID-文本-图像三角——无需特定任务塔或复杂的损失加权。

英文摘要

We introduce TriAlignGR, a unified multitask-multimodal framework for generative recommendation that establishes two-stage multimodal semantic propagation: (i) encoding visual semantics directly into SIDs via multimodal embeddings, and (ii) enabling the model to decode these semantics through visual description tasks. Existing Semantic ID (SID) pipelines suffer from two fundamental but underexplored problems: \textbf{SID Content Degradation (SCD)}, where cascaded encoding and residual quantization discard critical multimodal and interest-level semantics; and \textbf{SID Semantic Opacity (SSO)}, where models autoregressively generate SID sequences without truly comprehending their underlying meaning, leading to hallucination and poor generalization. Prior work addresses at most text-SID alignment, leaving visual semantics and latent user interests entirely unexploited. TriAlignGR resolves both problems through three tightly integrated components: (1)~\textbf{Cross-Modal Semantic Alignment (CMSA)} integrates visual content into SID construction through both VLM-generated textual descriptions and a multimodal embedding model that directly encodes image features alongside text, ensuring that SIDs inherently carry multimodal semantics; (2)~\textbf{Multimodal Deep Interest Mining (MDIM)} leverages LLM Chain-of-Thought reasoning to extract latent user intents (\eg ``productivity-focused lifestyle'' from noise-canceling headphones) beyond surface attributes, enriching SID semantics before discretization; and (3)~\textbf{Triangular Multitask (TMT)} jointly trains on eight complementary generation tasks under a single autoregressive loss -- including two novel visual-semantic tasks (VisDesc$\to$SID, VisDesc$\to$Title) that map VLM-generated image descriptions to SIDs and titles, completing the SID-Text-Image triangle -- without requiring task-specific towers or complex loss weighting.

2603.27799 2026-06-03 nlin.CG math.DS

Probabilistic Cellular Automata: between deterministic Wolfram's rules 23, 77, 178 and 232

概率元胞自动机:介于确定性Wolfram规则23、77、178和232之间

Francisco J. Muñoz, Juan Carlos Nuño

AI总结 研究介于Wolfram规则23、77、178和232之间的二进制概率元胞自动机,通过两个伯努利随机变量参数化,解析推导了达到各全局构型的渐近概率,并证明在参数非边界时渐近分布与初始条件无关。

Comments 12 pages, 3 figures

详情
AI中文摘要

我们研究一维二进制概率元胞自动机(PCA),它插值于Wolfram经典规则23、77、178和232之间。这些规则是仅有的满足两个准则的规则:(i)在邻域状态多数的情况下,中心格点取多数状态或相反状态;(ii)如果邻域状态平局,中心格点要么改变当前状态,要么保持不变。PCA由两个参数为$p,r \in [0,1]$的伯努利随机变量定义,我们通过马尔可夫过程公式解析求解了小尺寸情况。我们推导了对于所有初始状态,渐近达到每种可能全局构型的概率作为$p$和$r$的函数的解析表达式。我们证明,对于$0 < p,r < 1$,PCA达到任何状态的渐近概率分布与初始条件无关。这与确定性Wolfram规则23($p=0,r=0$)、77($p=1,r=0$)、178($p=0,r=1$)和232($p=1,r=1$)的行为形成对比,这些规则可能出现额外的渐近状态,特别是周期构型。最后,我们讨论了将这种PCA应用于描述涉及犹豫个体的意见动态。

英文摘要

We study one dimensional binary Probabilistic Cellular Automaton (PCA) that interpolate between Wolfram's classical rules 23, 77, 178 and 232. These rules are the only ones that satisfy two criteria: (i) in the case of a majority in the neighborhood states, the central site takes either the majority state or the opposite and (ii) if the neighborhood states are tied, the central site either changes its current state or keeps it. The PCA is defined by two Bernoulli random variables with parameters $p,r \in [0,1]$, and we analytically solve small size cases by using a Markov process formulation. We derive analytical expressions for the probability of asymptotically reaching each possible global configuration as a function of $p$ and $r$, for all initial states. We show that for $0 < p,r < 1$, the asymptotic probability distributions of achieving any of the states for the PCA are independent of the initial conditions. This contrasts with the behavior of the deterministic Wolfram's rules 23 ($p=0,r=0$), 77 ($p=1,r=0$), 178 ($p=0,r=1$) and 232 ($p=1,r=1$), for which additional asymptotic states can occur, in particular periodic configurations Finally, we discuss applying this kind of PCA to describe opinion dynamics involving hesitant agents.

2512.22547 2026-06-03 math.AP

The fibre operators in the Bloch-Floquet decomposition of periodic magnetic pseudo-differential operators

周期磁拟微分算子的Bloch-Floquet分解中的纤维算子

Horia D. Cornean, Bernard Helffer, Radu Purice

AI总结 本文研究了具有周期磁势的周期磁拟微分算子的纤维算子结构,给出了其分布核的显式公式,并证明了纤维算子是环面拟微分算子。

Journal ref J. Pseudo-Differ. Oper. Appl. 17, 40 (2026)

详情
AI中文摘要

我们研究了具有周期磁势的周期磁拟微分算子对应的纤维算子的结构。当这些纤维被视为d维环面上的算子时,以及当它们通过离散傅里叶变换被视为作用于离散ℓ^2空间上的无穷矩阵时,我们得到了其分布核的显式公式。此外,利用这些分布核,我们证明了纤维算子是环面拟微分算子。

英文摘要

We study the structure of the fibre operators corresponding to periodic magnetic pseudo-differential operators having periodic magnetic potentials. We obtain explicit formulas for their distribution kernel, both when these fibres are seen as operators on the $d$-dimensional torus, and also when they are seen as infinite matrices acting on a discrete $\ell^2$ space via a discrete Fourier transform. Moreover, using these distribution kernels we prove that the fibre operators are toroidal pseudo-differential operators.

2605.16531 2026-06-03 cs.NI

End-to-End Simulation of 5G NR Integrated Access and Backhaul Networks for Remote Maritime Connectivity

面向远程海上连接的5G NR集成接入与回传网络的端到端仿真

Alessandro Traspadini, Matteo Pagin, Raphaël Ihamouine, Rupert Lucas, Andrew Noren, Michele Zorzi, Marco Giordani

AI总结 本文概述了3GPP Release 16-18中IAB网络规范,提出了一个包含完整协议栈的ns-3 IAB模块,并在自定义海上场景中通过系统级仿真评估了不同拓扑和信道条件下的多跳动态网络性能。

Comments 13 pages, 7 figures, 1 table. This paper has been accepted for publication at IEEE Transactions on Communications, 2026. Please cite it as: A. Traspadini, M. Pagin, R. Ihamouine, R. Lucas, A. Noren, M. Zorzi, and M. Giordani, "End-to-End Simulation of 5G NR Integrated Access and Backhaul Networks for Remote Maritime Connectivity," IEEE Transactions on Communications, to appear, 2026

详情
AI中文摘要

毫米波(mmWave)第五代(5G)网络提供高数据速率,但由于严重的路径损耗和阻塞而面临覆盖挑战。这些问题促使使用集成接入与回传(IAB)作为灵活的无线回传解决方案,将连接扩展到小区边界和无光纤区域,包括海洋环境。本文概述了3GPP Release 16至18中IAB网络的最新规范。然后,它提出了一个用于IAB的ns-3模块,具有完整的端到端协议栈,包括回传适配协议(BAP)层、灵活的时隙和控制配置,以及基于时分和频分的复用方案。我们在一个自定义的海上场景中通过广泛的系统级仿真测试了IAB模块,其中配备IAB节点的船只可以同时作为接入点和中继,形成动态多跳网络,通过无线回传保持与岸基站的连接。我们评估了不同的拓扑和信道条件,为近海环境中毫米波IAB网络的设计和部署提供了见解。

英文摘要

Millimeter wave (mmWave) 5th generation (5G) networks offer high data rates but face coverage challenges due to severe path loss and blockage. These problems motivate the use of Integrated Access and Backhaul (IAB) as a flexible wireless backhaul solution that extends connectivity to cell boundaries and unfibered areas, including maritime environments. This paper overviews the latest 3GPP specifications for IAB networks in Releases 16 through 18. Then, it presents an ns-3 module for IAB, featuring a complete end-to-end protocol stack, including the backhaul adaptation protocol (BAP) layer, flexible slot and control configurations, and multiplexing schemes based on both time and frequency division. We test the IAB module via extensive system-level simulations in a custom maritime scenario where vessels, equipped with IAB-nodes, can simultaneously act as access points and relays, forming dynamic multi-hop networks that maintain connectivity via wireless backhaul to shore-based stations. We evaluate different topologies and channel conditions, providing insights into the design and deployment of mmWave IAB networks in offshore environments.

2605.15686 2026-06-03 astro-ph.HE gr-qc

Disformal Kerr Imprints on BHL Accretion: Shock Morphology, PSD Signatures, and Observational QPO Counterparts

变形克尔黑洞对BHL吸积的影响:激波形态、功率谱密度特征及观测准周期振荡对应体

Orhan Donmez, M. Yousaf, Imtiaz Khan, G. Mustafa

AI总结 通过研究缓慢旋转的变形克尔黑洞周围BHL吸积的流体动力学形态和时序行为,揭示了时空参数对吸积形态的影响,并发现弱变形偏离可产生与观测一致的低频和高频准周期振荡。

Comments 15 pages, 9 figures, 2 Tables. Table 2 and references are updated

详情
AI中文摘要

我们揭示了时空参数对缓慢旋转的变形克尔黑洞周围通过BHL机制形成的吸积形态的影响。因此,我们研究了这些参数对流体动力学形态和吸积流时序行为的可测量特征。结果表明,即使与克尔解的弱变形偏离也会改变激波锥结构,增强激波后区域的密度,并在吸积率中产生相干振荡。克尔模型在42.99 Hz和68.13 Hz处产生相干峰,这些频率与从源GRS 1915+105观测到的高频QPO一致。在偏离克尔解较弱的模型中,产生了低频QPO并发现它们是相干的。这些频率也落在银河系黑洞双星观测到的频率范围内。另一方面,与克尔解偏差较大的模型可用于解释更不规则、宽带且包含多个峰的观测结果。此外,通过使用本文中的反质量标度,数值计算的频率也与中等质量和大质量黑洞的观测结果进行了比较。特别地,发现变形黑洞模型与从源M82 X-1、NGC 5408 X-1和RE J1034+396获得的观测结果一致。这种比较还允许从模拟频率与观测频率之间的关系推断观测源可能的黑洞质量范围。这使得变形克尔几何中的BHL吸积成为连接修正引力黑洞时空与可观测QPO现象学的强大框架。

英文摘要

We reveal the effect of the spacetime parameters on the accretion morphology formed through the BHL mechanism around a slowly rotating disformal Kerr black hole. Thus, we investigate the measurable signatures of these parameters on the hydrodynamical morphology and the timing behavior of the accreting flow. It is shown that even weak disformal deviations from the Kerr solution modify the shock-cone structure, enhance the density in the post-shock region, and produce coherent oscillations in the accretion rate. The Kerr model produces coherent peaks at 42.99 Hz and 68.13 Hz, and these frequencies are consistent with the high-frequency QPOs observed from the source GRS 1915+105. In the models where the deviations from the Kerr solution are weak, low-frequency QPOs are produced and found to be coherent. These frequencies also fall within the frequency range observed in Galactic black-hole binaries. On the other hand, the models with large deviations from Kerr can be used to explain observational results that are more irregular, broad-band, and contain multiple peaks. In addition, by using inverse-mass scaling in this work, the numerically calculated frequencies are also compared with observations of intermediate-mass and supermassive black holes. In particular, the disformal black-hole models are found to be consistent with the observational results obtained from the sources M82 X-1, NGC 5408 X-1, and RE J1034+396. This comparison also allows the possible black-hole mass range of observed sources to be inferred from the relation between simulated and observed frequencies. This makes BHL accretion in disformal Kerr geometry a powerful framework for connecting modified-gravity black-hole spacetimes with observable QPO phenomenology.

2605.15101 2026-06-03 cond-mat.mtrl-sci cond-mat.mes-hall physics.optics

The Emergence of Photonic Crystalline Order and Time-Series Dynamics in NaCl Droplet Deposition

NaCl液滴沉积中光子晶体有序性和时间序列动力学的涌现

Grzegorz S. Żmija, Grzegorz Cios, Benedykt R. Jany

AI总结 本研究通过多尺度实验,揭示了NaCl液滴在锗基底上蒸发时,扩散各向异性主导晶体结构尺寸,并形成一维光子晶体纳米结构,提出了NaCl等效高度作为统一度量,建立了预测蒸发液滴结晶行为的实验框架。

详情
AI中文摘要

液滴蒸发过程中的结晶会产生复杂的自组织结构,然而有序功能相涌现的机制仍知之甚少。在本研究中,我们对NaCl在锗(001)基底上液滴蒸发过程中的结晶动力学进行了全面的多尺度研究,该基底因其红外应用而具有相关性。通过系统的微观表征,我们识别了多种微结构的形成,包括在混合晶体-玻璃光子系统中形成的一维光子晶体纳米结构。为了实现实验条件间的定量比较,我们引入了NaCl等效高度作为统一度量,用于描述和分类晶体形态的演化。我们的结果表明,扩散各向异性而非生长动力学主要决定了最大可达结构尺寸。定量薄膜干涉分析揭示了薄膜中存在离散厚度层。受控蒸发实验在整个液滴区域产生均匀的结晶模式,促进了有序光子结构的涌现。高度轮廓的时间序列动力学分析揭示了结晶前沿的时空演化,提供了对潜在物理机制细节的洞察。这些结果共同建立了一个稳健的实验框架,用于理解和预测蒸发液滴中的结晶行为,在材料合成、光子学和微尺度图案形成方面具有潜在应用。

英文摘要

Crystallization during droplet evaporation gives rise to complex, self-organized structures, yet the mechanisms underlying the emergence of ordered functional phases remain poorly understood. In this study, we present a comprehensive, multi-scale investigation into the crystallization dynamics of NaCl during droplet evaporation on a germanium (001) substrate, relevant for its IR applications. Through systematic microscopic characterization, we identify the formation of diverse microstructures, including 1D photonic crystal nanostructures formed within hybrid crystal-glass photonic system. To enable quantitative comparison across experimental conditions, we introduce the NaCl equivalent height as a unified metric to describe and classify the evolution of crystalline morphology. Our results reveal that diffusion anisotropy, rather than growth kinetics, primarily governs the maximal attainable structure size. Quantitative thin film interference analysis demonstrates the presence of discrete thickness layers in the film. Controlled evaporation experiments yield homogeneous crystallization patterns across the entire droplet area, facilitating the emergence of ordered photonic structures. Time-series dynamics analysis of height profiles uncovered the spatiotemporal evolution of the crystallization front, providing insights into the details of underlying physical mechanisms. Together, these results establish a robust experimental framework for understanding and predicting crystallization behavior in evaporating droplets, with potential applications in materials synthesis, photonics, and microscale pattern formation.

2605.14784 2026-06-03 cs.DC

Supervised Distributed Computing: Efficiency and Robustness under a Majority of Adversarial Workers

监督式分布式计算:在多数恶意工作节点下的效率与鲁棒性

John Augustine, Henning Hillebrandt, Manish Kumar, Christian Scheideler, Julian Werthmann

AI总结 本文研究监督式分布式计算范式,针对任意常数比例的恶意工作节点,提出一种鲁棒且高效的解决方案,使诚实工作节点的期望工作量接近每个任务仅执行一次。

详情
AI中文摘要

我们考虑最近提出的\emph{监督式分布式计算}范式\cite{augustine2025supervised},该范式扩展并细化了并行计算的标准主从范式。在该范式中,存在一个监督者、一个源节点、一个目标节点以及一组工作节点。分布式计算由一个监督者已知的无环任务图表示。源节点初始存储输入,目标节点应存储计算输出。计算中的各个任务应由工作节点在监督者的指导下执行。假设源节点、目标节点和监督者是可靠的,而工作节点中可能有$β$比例是恶意的,其中$β\in [0,1)$。这涵盖了例如监督者必须与不可信的志愿者合作的情况。在标准主从方法中,主节点检查工作节点是否正确执行分配的任务,这造成了严重的瓶颈,而在监督式方法中,监督者将这种检查外包给工作节点。在此工作之前,仅对$β$为足够小的常数的情况已知监督式解决方案。我们证明,对于\emph{任意}常数$β<1$,鲁棒且高效的监督式解决方案是可能的,同时诚实工作节点的期望工作量接近每个任务\emph{单次}执行,前提是存在一种轻量级验证机制,允许诚实工作节点检查任务输出的正确性,这显著优于迄今为止已知的所有鲁棒主从方法以及对等方法。

英文摘要

We consider a recently proposed \emph{supervised distributed computing} paradigm \cite{augustine2025supervised} that extends and refines the standard master-worker paradigm for parallel computations. In this paradigm, there is a supervisor, a source, a target, and a collection of workers. The distributed computation is given as an acyclic task graph that is known to the supervisor. The source initially stores the input and the target is supposed to store the output of the computation. The individual tasks of the computation are supposed to be executed by the workers under the guidance of the supervisor. The source, target and supervisor are assumed to be reliable, while a $β$-fraction of the workers might be adversarial, for some $β\in [0,1)$. This covers, for example, the case where a supervisor has to work with untrusted volunteers. In the standard master-worker approach, the master checks whether the workers correctly execute the assigned tasks, creating a severe bottleneck, whereas in the supervised approach, the supervisor outsources this checking to the workers. Prior to this work, only supervised solutions were known for the case that $β$ is a sufficiently small constant. We show that robust and efficient supervised solutions are possible for \emph{any} constant $β<1$ while the expected work for the honest workers is close to a \emph{single} execution per task, given that there is a lightweight verification mechanism that allows honest workers to check the correctness of task outputs, which is significantly better than all robust master-worker as well as peer-to-peer approaches known so far.

2605.14320 2026-06-03 math.OC cs.NA math.NA

Adaptive Metrics for Norm-Minimization-Based Outer Approximation in Convex Vector Optimization

凸向量优化中基于范数最小化的外部逼近的自适应度量

Mohammed Alshahrani

AI总结 提出一种自适应度量框架,通过动态改变标量化度量并利用问题几何结构,在凸向量优化的外部逼近算法中实现更优的收敛速率和迭代次数减少。

Comments Revised

详情
AI中文摘要

我们为有界凸向量优化中基于范数最小化的外部逼近算法开发了一种自适应度量框架。关键思想是让标量化度量在迭代过程中变化,同时用固定的欧几里得范数测量逼近误差。这使得算法能够动态利用问题的几何结构。我们的方法基于两个理论基础。首先,我们证明改进的欧几里得收敛速率 $O(k^{2/(1-q)})$ ——先前仅对标准 $\ell_2$ 范数已知——可以推广到所有固定的内积范数。其次,我们建立了一个分散定理,表明当上像具有有界曲率的严格凸边界时,算法生成的切割法线自然地在所有方向上扩散。这一几何条件保证了自适应度量在整个执行过程中保持良好条件。基于这些结果,我们推导出显式的收敛界,量化了度量条件如何影响豪斯多夫误差估计。在三个测试问题上的数值实验验证了理论收敛速率;在帕累托前沿具有足够曲率的问题上,自适应度量相对于固定欧几里得范数进一步减少了迭代次数。我们的结果为凸向量优化中的自适应度量选择提供了严格的基础。

英文摘要

We develop an adaptive-metric framework for norm-minimization-based outer approximation algorithms in bounded convex vector optimization. The key idea is to let the scalarization metric vary across iterations while measuring approximation error in a fixed Euclidean norm. This enables the algorithm to exploit problem geometry dynamically. Our approach rests on two theoretical foundations. First, we prove that the improved Euclidean convergence rate $O(k^{2/(1-q)})$ -- previously known only for the standard $\ell_2$-norm -- extends to all fixed inner-product norms. Second, we establish a dispersion theorem showing that the cut-normals generated by the algorithm naturally spread across all directions when the upper image has a strictly convex boundary with bounded curvature. This geometric condition guarantees that the adaptive metric remains well-conditioned throughout execution. Building on these results, we derive explicit convergence bounds that quantify how metric conditioning influences the Hausdorff error estimates. Numerical experiments on three test problems validate the theoretical convergence rate; on the problems whose Pareto fronts have sufficient curvature, the adaptive metric additionally reduces the iteration count relative to the fixed Euclidean norm. Our results provide a rigorous foundation for adaptive metric selection in convex vector optimization.